Discharge-valve for fluid-compressors.



PATENTED DEC. 17, 1907 W. PRBLLWITZ. LVE FOR FLUID 0'0 MPRESSORS;

DISGHARGE VA APPLICATION FILED JAN. 18,-1905.

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I No. 874,034.

unrrnr) STATES PATENTOFFIGE.

SERGEANT DRILL COMPANY, OF NEW YORK, N.

GINIA DISCHARGE-VALVE Specification of Letters Patent.

Y., A CORPORATION OF WEST VIR- FOR FLUID-COMPRESSORS.

' ZPatented Dec. 17, 19 07,"

Application filed January 18. 1905- Serial No. 2411303. 1

To all whom it may concern: I

Be it known that 1, WILLIAM PRELLWITZ, a citizen of the United States, and resident of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful Improvement in Discharge-Valves for Fluid-Compressors, of which the following is a specification.

t has been found by practical experience that where the discharge valve seats of fluid compressors are rigidly secured in position in the cylinders, as, for instance, by screwing them. into position, the different strains imposed upon the valve seats frequently cause them to work loose and crack or break, thus rendering them useless.

The object of this present invention is toprovide certain improvements in the construction, form and arrangement of the several parts of a discharge valve whereby thevalve seat is yieldingly held in position within its support thus obviating the liability of the seat to become loosened, cracked or broken.

One embodiment of this invention is rep resented in the accompanying drawings in which 4 Figure 1 re resents a portion of a fluid compressor cy' inder' in section with the discharge valve shown in position therein, the discharge valve being in longitudinal central section; Fig. 2 is an inverted plan view of the cage, Fig. 3 is a transverse central section on an enlarged scale of the valve seat, Fig. 4 is a top plan view of the same, Fig. 5 is a detail section through one of the ribs which connect the disk portion with the ring portion of the valve seat, Fig. '6 is a vertical central section through the valve proper, Fig. 7 is a bottom plan vlew of the same, and Fi 8 is a detail side view of the sliding pin whic is held pressed against the valve seat by the valve seat holding spring.

The innerwall .of the cylinder is denoted by 1 and its outer wall by 2. The outlet port between the walls is denoted by 3. The outer wall 2 has a hole 4 therethrough of sufiicient diameter to permit the insertion and removal of the valve and its seat. The inner wall 1 of the cylinder is provided with a hole 5 therethrough the upper portion of which is enlar ed to produce an annular recess 6 surrounding the hole. Tl e'valve seat herein shown comprises a central or disk portion 7 'p iovided with an annular shoulder 16 bea and an outer or ring portion 8 connected at The outer wall of the of the valve seat has an easy intervals by ribs 9. ring portion 8 sliding fit with inner wall of the cylinder. 8 of the valve seat is further provided with an annular flange 10 which fits within the annular recess 6 around the outer end of the hole 5.

' The valve cage is denoted by 11 and it has a flanged head 12 which is bolted or otherwise secured to the outer wall 2 around the hole4. The discharge valve proper herein shown comprises a ring portion 13 from which uprises an-annular shank 14 the outer walls of which are fitted to slide in engagement with the inner walls of the cage 11.

the walls of the hole 5 in the This ring portion The head 12 of the cage 11 has a centrally arranged depending hollow 0st 15 the bore both en s. This post is tween which and the ring 13 of the valve is interposed a spring 17 for yieldinglyholding the valve closed. A ing fit within the bore of the hollow post 15, the inner end of which pin rests upon the central or disk portion 7 of the valve seat. An

' adjusting bolt 19 has a screw-threaded en gagement with the upper portion of the bore of the hollow post 15, which bolt has a re duced portion 20 close proximity to the outer 'end of the pin 18 when the bolt is in position. A s ring 21 is interposed between the screw-t readed portion of the bolt 19 and the outer .end of the pin' 18 for; yieldin'gly pressing the pin against the valve seat the seat in its position within the hole 5. The strength of the spring 21 should be sufpin 18 has an easy slid-'1 or normally holding which extends down intoficientto exert a greater pressure upon the valve seat than the excess pressure from the cylinder due tothe compression of the fluid sufficient to open the discharge valve against the tension of its spring 17. The. reduced portion weakened it will en agethe outer endolfthe sliding pin 18 and limit its outward-unevemerit before the valve seat can lift out-of its hole a sufficient distance to permititheea cape of pressure around its-outer ,walls.

By (permitting the valve seatl to have a limite yielding movement the liability of 20 of the bolt 19 is so -arranged that even should the spring 21 become broken or the seat to work loose and become cracked or broken under the various strains to which it is subjected, is obviated, thereby insuring a material saving in this vital part of the compressor.

It is evident that the valve might be used either vertically or at any other angle with respect to the cylinder and can be used in connection with single-acting or compound compressors. It is also evident that while the engaging walls of the valve seat and hole are shown vertical, they may be made tapered if desired. It is also evident that ticular form herein shown, but

be limite to the par- What I claim as my invention is:

. A valve seat, its support, a discharge valve ro er, its cage having a centrall arranged oll dwpost, a pin for yieldingly olding the valve seat in position, fitted to slide in said hollow post, a spring for holding the pin pressed a ain'st the said seat and an adjusting bolt avin a screw-threaded engagement with the l mre of the said hollow post and arranged as a stop for the pin to limit the movement of the seat away from its support.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this 16th day of WILLIAM PRELLWITZ. Witnesses:

FREDK. HAYNEs, HENRY THLEME.

anuary 1905. 

